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the Crystal Cavern - a small-medium sized module (1/2 dozen large areas and some smaller ones) challenging for a party of 3-4. Made for Server Vault online play, I hosted this for 3-4 friends and played 4 sessions of several hours each, with most cha a challenging module for a small party, made for Server vault mostly outdoor exploring, some puzzles and traps and much fighting on a simple quest.